They're gonna end it all in one single chapter?? Im predicting either harem ending or "leave it to your imagination" ending, both of which are pretty bad imo
My dude, you are dating her, she invited you to her house, she put on an erotic cosplay for you and now she wants to take a bath with you. It is perfectly fine for you to look at her in an "Erotic" way and even be a bit aggressive, she's your girlfriend and she *clearly* wants it.